The State of Alderney is an American state located to the west of Liberty City. Although the two states are completely independent from one another, the state's capitol of Alderney City is known by many as being part of Liberty City's metropolitan area. The state is only a little bit smaller than the neighboring Algonquin borough of Liberty City, but it is not known if the what is seen in-game is the whole of the state or whether it is just a section of it.

The State of Alderney is based on the State of New Jersey, the state capital of Alderney City shares many similarities with Jersey City and unlike Liberty City it is much more consistent with its real-life counterpart in terms of spatial planning and geography. The state is mostly made up of in game representations of real life cities and townships in Hudson County, New Jersey however it also features portions of Bergen County (Leftwood) and Union County (Elizabeth).

Crime

Crime and corruption are no less common in Alderney City than in Liberty City. The most crime-ridden areas in the city are south and central Alderney City in the neighborhoods of Acter, Berchem, and some parts of Tudor. The Pegorino Family and the Korean Mob conduct organized crime from within the city and Mafia families from Liberty City, such as the Ancelottis and Pavanos, also run operations there. The Alderney chapters of The Lost MC and M.O.B. are also active in the city.

The police officers of Alderney City wear uniforms different from those of Liberty City that resemble those of the New Jersey State Police. Contrary to this independence, the Alderney City police use vehicles bearing the livery of the LCPD. The reason for this sharing of a police force between two cities in two different states is never explained. Perhaps Alderney City could not afford to establish their own police force and, due to the city's proximity to Liberty City, made an arragement to share a metroploitan police force. This ability of a police force to operate across state lines is strange.

Gangs of Alderney

Food & Drink

Alderney's dining services mostly come from fast food chains, such as the Pizza This and Burger Shot in Leftwood and Westdyke. Cluckin' Bell and Wigwam Burger are also seen around Berchem. The hot dog and peanut vendors spread throughout Alderney City. Alderney also has traditional restaurants such as Mr. Fuk's Rice Box, a Korean restaurant located in Alderney City.

Transportation

Alderney's outer reaches are supplied by the Plumbers Skyway. The state is connected to Liberty City by the Booth Tunnel and Hickey Bridge, both of which cross the West River. A ferry terminal is under construction in Castle Garden City, Algonquin, which would supposedly connect it with the completed Alderney terminal, but the terminal is abandoned, and construction is only in progress on the Algonquin end.

Highways

Tunnels

Streets

Much like other streets, Alderney streets are named after famous objects or people. Northern Alderney streets are named after mountain ranges, Owl Creek Ave, Beaverhead Drive, Big Horn Drive. Central Alderney streets are named after inventors, Babbage Drive, Farnsworth Road, Edison Ave, and cult leaders, Koresh Sq, Applewhite St, Hubbard Ave, and in Southern Alderney streets are after American nuclear tests, Plumbbob Ave, Niblick St and Tinderbox St.

Subway

As an independent state, Alderney does not have a subway. However, around the state, the remnants of a rail system can be found. Although these tracks obviously once carried freight trains, they could have shared passenger service as well.

Trivia

If Alderney is accessed at the start of the game before neither Algonquin or Alderney is unlocked; it will be abandoned. There will be no cars or people in the state. (Except for the police, who will be chasing you). However, Algonquin is inhabited. This glitch does not occur on the PS3 version.

Alderney is a neighboring island to Jersey in the English Channel, hence the name "Alderney" replacing "New Jersey" in GTA IV.

Some dialogue in the game refers to Alderney as “Guernsey” (Guernsey is another neighboring Channel Island to Jersey, just as Alderney is), suggesting that, at some point in GTA IV's development, the state may have carried its GTA 1 name of "New Guernsey"; "Guernsey" may, however, simply be a nickname for the state. James Pegorino mentions both names in the Payback mission cutscene.

Although Alderney's police officers wear a New Jersey State Police styled uniform rather than the standard LCPD uniform, they reside at LCPD stations, and drive LCPD cruisers, making them part of the same City Police Department. Some officers will announce themselves as being a state trooper while others will announce themselves as the LCPD.

Alderney is considered a very poor and unneccessary state. In the in-game internet it's stated that not even a terrorist would want to live in Alderney. However, this is a joke, just caused by hatred from someone from Liberty City. In real life, New Jersey is the second richest state.

It's stated in 'The Episodes from Liberty City' instruction manual that Alderney is a dreary suburbia with industrial wastelands and strip malls.

In the beta map for GTA IV, Alderney appeared to have a piece of land extending to the north which was removed during development.

Many of the houses in Alderney (specifically Westdyke) have garage doors that open when approached with a vehicle, however the door will not close after you get out, nor can you save vehicles here.

Alderney is the single state in whole GTA series to not included an airport or a railway system but it is unknown if the present Alderney in GTA IV is just a part of the state.